Milo c



M. C. CAUGHREAN.

INCANDESCENT ELECTRIC LIGHT.

APPLICATION HLED MAY 12. 1917.

1,323,963, Patented Dec. 2,1919.

MILO C. CAUGHREAN, OF KETCHIKAN, TERRITORY OIE ALASKA.

INCANDESCENT ELECTRIC LIGHT.

Specification of Letters Patent.

Patented Dec. 2, 1%19.

Application filed May 12, 1917. Serial No. 168,117.

To aZZ whom it may concern Be it known that I, MILO C. CAUGHREAN, a citizen of the United States, and a resident of Ketchikan, Territory of Alaska, have made certain new and useful Improvements in Incandescent Electric Lights, of which the following is a specification.

My invention relates to electric light globes to be used with search lights, head lights of automobiles, spot lights, and any other similar devices.

An object of my invention is to provide' an electric light globe having a reflector whereby certain rays of light, whichwould ordinarily diverge, are reflected toward the main parabolic reflector from which they are again reflected in a direction more nearly parallel to the axis of the main reflector, thereby condensing the light.

A further object of my invention is to eliminate, toa large extent, certain divergent rays, and thereby obviate the danger which attends the use of search lights owing to the blinding glare which sometimes is encountered by people who are passing, even if the main body of light is concentrated on another object. The invention is particularly adapted for search lights on vessels, the invention serving to cut out certain divergent rays which tend to blind those on the deck of the vessel.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

' My invention is illustrated in the accompanying drawings which form a part of this application, in which Figure 1 is a section through an automobile head light.

Fig. 2 is a section through a modified form of the device, and

Fig. 3 is a section through a search light showing one embodiment of my invention.

In carrying out my invention I make use of a main parabolic reflector l which may be of any suitable material, such as glass having a reflecting backing, polished metal, or the like. The electric light globe 2 has the usual filament 3. Supported near the filament is a small reflector 4 which is curved to reflect rays of light back again upon I the main reflector 1. The filament 3 is held on an insulating base 6 and the globe 2 is provided with the usual connections with the socket 7. These connections may be of any screw type, such as the Edison screw connection, the Ediswan, or any other suitable means of attachment.

From the foregoing description of the various parts of the device, the operation. thereof may be readily understood.

The globe 2 is preferably of such dimensions that the filament 3 and the small reflector +1 are disposed substantially at the focus of the main parabolic reflector 1. Now it will be obvious that the rays of light from the filament 3 which strike the small reflector 4: will be reflected back to the large parabolic reflector l.

The reflector 4 has a curvature such that the rays that are reflected from it will be reflected again .by the parabolic reflector in substantially parallel lines, such as those shown at X. Such rays would of course diverge if the reflector 4 were not present, but being reflected to the main reflector and again reflected, the light will be concentrated instead of diverged. That light which is directly transmitted to the reflector l by the filament is reflected in substantially parallel lines as shown at Y. The result is that many of these divergent 'rays are cut out or rather are reflected in a direction more nearly parallel with 'the axis of the main reflector.

In Fig. 2, I have shown a modified form of the device inwhich the small reflector 4 is'not held by the same wires which hold the filament 3, as in Fig. 1, but by additional Wires 8. The principle upon which the device works however, is substantially. the same. That is to say, the filament 3, as well as the reflector L being disposed substantially at thefocus of the parabolic reflector 1 both send rays to this reflector which are reflected in the, general direction parallel to the axis of the main reflector 1.

In Fig. 3 I have shown a search light casing 9 in which there is a bulb 2 having a fllamentB and a reflector 4. The arrangementi is similar to that described in F ig, 1, the rays of light which pass from the filament to the reflector 4 being again reflected by the main parabolic reflector 1 and passing out of the search-light casing in substantially parallel lines.

It will be understood that it is impossible to make all of the rays which are sent out. by the filament and the small reflector 4 pass in a direction exactly parallel to the main axis, but by making the filament relatively ting out many diverging rays, thus eliminating the glare on each side of the beam of the parallel rays,-and adding to the intensity of the beam.

By constructing the electric light globe with the reflector inside thereof, the globes themselves may be sold to users of parabolic reflectors who can replace the ordinary lamps with these improved globes and thereby secure the results enumerated above;

I claim v 1. The combination with a main parabolic reflec-tor,-of an incandescent lamp comprising an insulated base, a transparent globe carried by said base, a filament within the globe, rigid supporting arms carried by said base at opposite sides of said filament and extending forwardly beyond same, a secondary reflector having its reflecting surface facing said filament and the main reflector, and supported stationarily at the forward ends of said supporting arms, said filament being disposed substantially at the focus of the main reflector.

2. The combination with a main parabolic. reflector, of an incandescent light comprising a base, a transparent globe carried by the base, a filament also carried by the base, rigid arms carried by the base and extending outwardly therefrom, a curved reflector supported stationarily at the outer ends of said arms, said curved reflector being disposed symmetrically with respect to the axis of the parabolic reflector between said filament and said globe, and the reflecting surface of said curved reflector facing said filament and also said main parabolic reflector, said filament being situated substantially the main parabolic reflector.

. MILO C. .CAUGHREAN.

at the focus of 

